4-Methoxycarbonyl-pyrazole ether derivatives

ABSTRACT

Substituted pyrazole ether derivatives, and salts thereof, having a herbicidal action, herbicides containing these compounds as active ingredients, and processes for controlling the growth of unwanted plants with these compounds.

This is a continuation, of application Ser. No. 049,506 filed June 18, 1979, now abandoned.

The present invention relates to novel and valuable substituted pyrazole ether derivatives, and salts thereof, having a herbicidal action, herbicides containing these compounds as active ingredients, and processes for controlling the growth of unwanted plants with these compounds.

The use of substituted pyrazoles and pyrazolium salts, e.g., 1,2-dimethyl-3,5-diphenylpyrazolium methyl-sulfate, as herbicides has been disclosed (German Laid-Open Applications DE-OS Nos. 2,513,750 and 2,260,485). Further, the prior art agent 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide (German Pat. No. 1,542,836) is used in large amounts in practice as a herbicide.

We have now found that pyrazole ether derivatives of the formula ##STR1## where R¹ denotes hydrogen, cyano, an unsubstituted aliphatic hydrocarbon radical, an aliphatic hydrocarbon radical mono- or polysubstituted by halogen, hydroxy, acyloxy, alkoxy, alkylthio, alkoxycarbonyl, alkylaminocarbonyl or by dialkylaminocarbonyl, R¹ further denotes acetoacetyl, alkylaminosulfonyl, alkylsulfonyl, arylsulfonyl or ##STR2## X denoting oxygen or sulfur and R⁵ denoting hydrogen, alkoxyalkyl, alkyl, haloalkyl, aralkyl or aryl which is unsubstituted or mono- or polysubstitued by halogen, cyano, nitro, alkyl, alkoxy, akylthio, haloalkyl, alkoxycarbonyl or alkoxycarbonylamino, R¹ further denotes ##STR3## X and Y being identical or different and denoting oxygen or sulfur, and R¹⁰ having the same meanings as R⁵, R¹ further denotes ##STR4## X denoting oxygen or sulfur, R¹¹ having the same meanings as R⁵ and R⁶ denoting hydrogen or having the same meanings as R⁵, R² denotes Y--R⁷, Y denoting oxygen or sulfur and R⁷ denoting an aliphatic, cycloaliphatic or araliphatic hydrocarbon radical, a heterocyclic radical or an aryl radical, these radicals being unsubstituted or mono- or polysubstituted by alkyl, halogen, haloalkyl, cycloalkyl, aryloxy, alkoxy, alkylthio, nitro, cyano, alkylaminocarbonyl, dialkylaminocarbonyl, acyloxy, acylamino, O-alkylcarbonyl, S-alkylcarbonyl, aryl or a heterocycle, R³ denotes halogen, cyano, nitro or ##STR5## X and Y being identical or different and denoting oxygen or sulfur, R⁸ denotes an aliphatic, cycloaliphatic or araliphatic hydrocarbon radical, an aryl radical or a heterocyclic radical, these radicals being unsubstituted or substituted by halogen, cyano, haloalkyl, alkoxy or alkylthio, and R⁹ and R¹² being identical or different and denoting hydrogen or methyl, and R⁴ denotes hydrogen, alkyl, halogen, alkoxy, alkylthio, cyano, haloalkyl, alkoxycarbonyl, unsubstituted phenyl, or alkyl- or halogen-substituted phenyl, and salts of such pyrazole ether derivatives, have a good herbicidal action and are tolerated well by crop plants.

Salts are those with inorganic or organic acids, e.g., hydrochloric acid, orthophosphoric acid, sulfuric acid, formic acid, trichloracetic acid, methanesulfonic acid, p-toluenesulfonic acid and dodecylbenzenesulfonic acid.

The new pyrazole ether derivatives are usually in isomer form: ##STR6##

The isomer ratio is determined essentially by the various substituents.

Unless it is specifically mentioned in the following that only one of the two isomers is present, the isomer mixture shall always be meant by a certain formula or designation.

Examples of meanings for R¹ in the general formula are hydrogen, cyano, linear or branched alkyl of 1 to 6 carbon atoms which is unsubstituted or mono- or polysubstituted by fluoro, chloro, bromo, hydroxy, acyloxy (with 2 to 4 carbon atoms in the acyl), alkoxy or alkylthio (with 1 to 4 carbon atoms in the alkyl), or by alkoxycarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl (each with 1 to 3 carbon atoms in the alkyl).

R¹ may also for instance denote acyl, such as acetoacetyl, methanesulfonyl, p-toluenesulfonyl, methylaminosulfonyl, or the acyl radicals ##STR7## X and Y being identical or different and denoting oxygen or sulfur and R⁵, R¹⁰ and R¹¹ denoting for instance linear or branched alkyl of 1 to 16 carbon atoms which is unsubstituted or substituted by halogen, cyano, alkoxy or alkylthio of 1 to 4 carbon atoms.

R⁵, R¹⁰ and R¹¹ may also denote for instance linear or branched alkenyl of 2 to 6 carbon atoms which is unsubstituted or chloro-substituted, cycloalkyl of 3 to 8 carbon atoms, or aralkyl (with 1 to 3 carbon atoms in the alkyl and 6 to 10 carbon atoms in the aryl) which is unsubstituted or mono- or polysubstituted by fluoro, chloro, bromo, alkyl, alkoxy or haloalkyl of 1 to 4 carbon atoms.

Finally, R⁵, R¹⁰ and R¹¹ may also denote for example aryl of 6 to 10 carbon atoms which is unsubstituted or mono- or polysubstituted by fluoro, chloro, bromo, alkyl, alkoxy, alkylthio and haloalkyl of 1 to 4 carbon atoms, alkoxycarbonyl and alkoxycarbonylamino (=--NH--CO₂ --Alk) of 1 to 3 carbon atoms in the alkyl, or by nitro or cyano.

R⁶ denotes for instance hydrogen or linear or branched alkyl of 1 to 3 carbon atoms.

R² denotes the group --Y--R⁷, Y denoting oxygen or sulfur and R⁷ denoting for example linear or branched alkyl of 1 to 18 carbon atoms which is unsubstituted or mono- or polysubstituted by fluoro, chloro, bromo, cyano, nitro, cycloalkyl, alkoxy or alkylthio of 1 to 4 carbon atoms; unsubstituted or fluoro-, chloro-, methoxy-, methyl- or trifluoromethyl-substituted aryloxy of 6 to 10 carbon atoms in the aryl; alkoxycarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl of 1 to 4 carbon atoms in the alkyl; acyloxy of 2 to 4 carbon atoms in the acyl; or by saturated or unsaturated five- or six-membered heterocyclic compounds containing up to 3 hetero atoms which may be identical or different.

Preferred five-membered heterocycles are pyrazole, imidazole, furan, thiophene, tetrahydrofuran, isoxazole, 1,3-dioxolane, 1,2,4-triazole and 1,3,4-thiadiazle; preferred six-membered heterocycles are piperidine, pyridine and tetrahydropyran.

R⁷ may also denote linear or branched alkenyl of 3 to 18 carbon atoms which is unsubstituted or mono- or polysubstituted by chloro, or cycloalkyl of 3 to 8 carbon atoms which is unsubstituted or mono- or polysubstituted by alkyl, alkoxy, haloalkyl of 1 to 4 carbon atoms, fluoro, chloro or bromo.

R⁷ may further denote for instance aralkyl of 1 to 3 carbon atoms, in the alkyl and 6 to 10 carbon atoms in the aryl and which is unsubstituted or mono- or polysubstituted by alkyl, alkylthio, alkoxy, haloalkyl, alkoxycarbonyl of 1 to 4 carbon atoms, fluoro, chloro or bromo; aryl of 6 to 10 carbon atoms which is unsubstituted or mono- or polysubstituted by fluoro, chloro, bromo, cyano, trifluoromethyl, nitro, or by alkyl, alkoxy, alkylthio, alkoxycarbonyl, alkylaminocarbonyl or dialkylaminocarbonyl, each alkyl being of 1 to 4 carbon atoms; aryl of 6 to 10 carbon atoms which is substituted by phenyl or phenoxy which in turn may be substituted by fluoro or chloro; or phenyl substituted by lower (C₁ to C₄) alkyl esters of (thio)-glycolic acid or (thio)-lactic acid via a (thio)-ether bond.

Further, R⁷ may for example denote heterocyclic 5- or 6-membered rings, such as 3-tetrahydrofurfuryl, 4-piperidyl and 2-(1,3,4)-thiadiazole.

R³ for instance denotes halogen, especially chlorine and bromine, cyano, nitro or, preferably, ##STR8## or ##STR9## X and Y being oxygen or sulfur, R⁹ and R¹² being hydrogen or methyl, R⁸ being linear or branched alkyl of 1 to 6 carbon atoms which is unsubstituted or mono- or polysubstituted by fluoro, chloro, cyano, methoxy or trifluoromethyl, or being for instance cycloalkyl of 3 to 6 carbon atoms, or phenyl or benzyl which is unsubstituted or mono- or polysubstituted by fluoro, chloro, bromo, trifluoromethyl, cyano, methoxy or methylthio.

When R³ denotes for example ##STR10## R⁸ may also be a 5- or 6-membered heterocyclic ring which may be saturated or aromatic, e.g. tetrahydrofuran, pyrazole, imidazole, 1,2,4-triazole, and piperidine.

R⁴ denotes for example hydrogen, linear or branched alkyl of 1 to 6 carbon atoms, cycloalkyl of 3 to 6 carbon atoms, chloro, bromo, cyano, alkoxy or alkylthio of 1 to 3 carbon atoms, trifluoromethyl, alkoxycarbonyl of 1 to 3 carbon atoms, and phenyl which is unsubstituted or mono- or polysubstituted by methyl fluoro and chloro.

The preparation of the new pyrazole ether derivatives is described in more detail below.

The compounds can be manufactured by processes known from the literature, e.g., Ark. Kemi, 4, 297-232, 1952, Ark. Kemi, 8, 523-544, 1955, and Chem. Ber., 92, 2593, 1959.

When R¹ is hydrogen, R² is methoxy, R³ is ethoxycarbonyl and R⁴ is methyl, the reaction may be represented by the formula scheme (2): ##STR11##

The pyrazole ether derivative obtained as hydrochloride is neutralized by conventional methods and separated from elemental sulfur by extraction or recrystallization. The thiocarbonic acid alkyl ester hydrazide (A) required as intermediate may be prepared by conventional methods, e.g., Acta chem. Scand., 23, 1916-1934, 1969.

The manufacture of 2-chloro-1,3-dicarbonyl compounds such as (B) is also known, e.g., by reaction of the β-dicarbonyl compound with sulfuryl chloride.

The following examples illustrate the method of manufacture.

EXAMPLE 1 3-(3,3,5-trimethylcyclohexyloxy)-5-methyl-4-methoxycarbonyl-pyrazole

At 100° C., 128 g of 3,3,5-trimethylcyclohexanol is introduced into a suspension of 18 g of sodium hydride (80 wt% in paraffin oil). The mixture is boiled until no more hydrogen evolves. After the mixture has cooled, 46 g of carbon disulfide is dripped in, and the whole is stirred for 1 hour at room temperature (20° C.). 250 ml of water is then added, the resultant mixture is vigorously stirred, and the aqueous solution is separated. The aqueous xanthate solution obtained is placed in a stirred flask and 70 g of sodium chloroacetate is added. After the mixture has been stirred for 12 hours at room temperature, 60 g of hydrazine hydrate is run in while stirring, and stirring is continued for a further 4 hours at room temperature. The oil which separates out is extracted with methylene chloride and dried over sodium sulfate.

The solvent is evaporated, leaving an oil (120 g, n_(D) ²⁵ =1.5100) whose composition (C₁₀ H₂₀ N₂ OS) is proved by combustion analysis and nmr spectroscopy.

At room temperature and while stirring, 84 g of methyl 2-chloroacetate is added to a solution, in 250 ml of acetonitrile, of the thiocarbazic acid-O-(3,3,5-trimethylcyclohexyl)-ester obtained in this manner. After stirring for 12 hours at room temperature, the mixture of solids which has precipitated out is separated by filtration and washed with acetone. The solids mixture is then stirred into 200 ml of aqueous ammonia solution (12 wt%) and subsequently extracted twice with methylene chloride (150 ml each time). After the methylene chloride solution has been dried over sodium sulfate, the solvent is evaporated. The solid which remains has, after recrystallization from a 2:1 mixture of toluene and n-hexane, a melting point of 167° to 168° C. and has, according to combustion analysis and nmr spectroscopy, the composition: ##STR12##

EXAMPLE 2 3-Benzylthio-5-methyl-4-methoxycarbonyl pyrazole

At room temperature, 47 g of methyl 2-chloroacetate is added to a solution of 55 g of dithiocarbazic acid-S-benzyl ester in 250 ml of tetrahydrofuran. After stirring for 16 hours at room temperature, the precipitated solids mixture is filtered and washed with diethyl ether, and the residue is stirred into 200 ml of 12% strength ammonia solution. The product has the sulfur removed from it by extraction with methylene chloride. After drying over sodium sulfate, the methylene chloride is distilled off and the solid which remains is recrystallized from ethyl acetate. Melting point: 109°-110° C.

EXAMPLE 3 Acetate of 3-(2',3'-dimethylphenoxy)-5-methyl-4-methoxycarbonyl pyrazole

15 g of 3-(2',3'-dimethylphenoxy)-5-methyl-4-methoxycarbonyl pyrazole is added to 25 g of acetic anhydride and the mixture is boiled for 5 minutes. After cooling, 150 ml of water is added and the mixture vigorously stirred for 30 minutes. After filtration and drying, a white solid (m.p. 111° C.) is obtained in almost quantitative yield.

EXAMPLE 4 1,4-Bis-(methoxycarbonyl)-3-(2',3'-dimethylphenoxy)-5-methyl pyrazole

A mixture of 5.6 g of triethylamine, 13 g of 3-(2',3'-dimethylphenoxy)-5-methyl-4-methoxycarbonyl pyrazole and 100 ml of tetrahydrofuran is prepared, and, while stirring and cooling, 4.9 g of methyl chlorocarbonate is dripped in. After stirring for 16 hours, the precipitated hydrochloride is filtered off. The filtrate is concentrated and the residue is recrystallized from ethyl acetate. Melting point: 115° C.

The following compounds were obtained analogously:

    __________________________________________________________________________      ##STR13##                                                                     No.                                                                               R.sup.1        R.sup.2            R.sup.3     R.sup.4                                                                              m.p.                    __________________________________________________________________________                                                            (°C.)            5  hydrogen       OCH.sub.3          CO.sub.2 CH.sub.3                                                                          CH.sub.3                      6  "              OC.sub.2 H.sub.5   "           "                             7  "              OC.sub.3 H.sub.7i  "           "     125-126                 8  "              OC.sub.4 H.sub.9n  "           "                             9  "              OC.sub.4 H.sub.9sec.                                                                              "           "     65-67                   10 "              OC.sub.4 H.sub.9iso                                                                               "           "     86                      11 "              OC.sub.4 H.sub.9tert.                                                                             "           "                             12 acetyl         OC.sub.4 H.sub.9sec.                                                                              "           "     83                      13 chloroacetyl   OC.sub.4 H.sub.9sec.                                                                              "           "                             14 dichloroacetyl "                  "           "                             15 acetyl          OC.sub.3 H.sub.7i "           "     58-59                   16 propionyl      "                  "           "                             17 methoxyacetyl  "                  "           "                             18 hydroxymethyl  "                  "           "                             19 acetoxyacetyl  OC.sub.4 H.sub.9iso                                                                               "           "                             20 acetoacetyl    "                  "           "                             21 methoxycarbonyl                                                                               "                  "           "                             22 isopropoxycarbonyl                                                                            "                  "           "                             23 phenoxycarbonyl                                                                               "                  "           "     104-105                 24 CH.sub.2CONHCH.sub.3                                                                          "                  "           "                             25 CH.sub.2CO.sub.2 CH.sub.3                                                                     OC.sub.4 H.sub.9iso                                                                               CO.sub.2 CH.sub.3                                                                          CH.sub.3                      26 SO.sub.2CH.sub.3                                                                              "                  "           "                             27                                                                                 ##STR14##     "                  "           "                             28 SO.sub.2NHCH.sub.3                                                                            OC.sub.4 H.sub.9iso                                                                               CO.sub.2 CH.sub.3                                                                          CH.sub.3                      29 COSC.sub.3 H.sub.7i                                                                           "                  "           "                             30 CSN(CH.sub.3).sub.2                                                                            ##STR15##         "           "                             31                                                                                 ##STR16##     "                  "           "                             32 CONHCH.sub.3   "                  "           "                             33                                                                                 ##STR17##     "                  "           "                             34                                                                                 ##STR18##     "                  "           "                             35                                                                                 ##STR19##     "                  "           "                             36 CN                                                                                             ##STR20##         "           "                             37                                                                                 ##STR21##     "                  "           "                             38 benzoyl        "                  "           "                             39 2',4'-dichlorobenzoyl                                                                         "                  "           "                             40 hydrogen       "                  "           "     123                     41 acetyl         "                  "           "                             42 phenoxycarbonyl                                                                               "                  "           "     104-106                 43 3'-chlorophenoxy-                                                                             "                  "           "                                carbonyl                                                                    44 hydrogen       SC.sub.3 H.sub.7i  "           "     117-119                 45 phenoxycarbonyl                                                                               "                  "           "                             46 3'-chlorophenoxy-                                                                             "                  "           "                                carbonyl                                                                    47 hydrogen       OC.sub.3 H.sub.7i  CO.sub.2 C.sub.3 H.sub.7i                                                                  "     amorphous               48 hydrogen                                                                                       ##STR22##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             oil,n .sub.D.sup.30                                                             = 1.4800               49 hydrogen       cyclopentyl-       CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             84                                        methyloxy                                                    50 "              2-pentyloxy        "           "     oil,n .sub.D.sup.23                                                             = 1.4960               51 acetyl         cyclopentyl-       "           "     75-76                                     methyloxy                                                    52 hydrogen                                                                                       ##STR23##         "           "     81                      53 "              OCH(C.sub.2 H.sub.5).sub.2                                                                        "           "     80-82                   54 "                                                                                              ##STR24##         "           "     oil,n .sub.D .sup.2                                                            6 = 1.4982              55 "              OCH(n-C.sub.3 H.sub.7).sub.2                                                                      "           "     61                      56 "              OCH(C.sub.3 H.sub.7i).sub.2                                                                       "           "     82                      57 "                                                                                              ##STR25##         "           "     126-127                 58 acetyl         "                  "           "                             59 phenoxycarbonyl                                                                               "                  "           "                             60                                                                             3'-chlorophenoxy-                                                                 "              "                  "                                            carbonyl                                                                    61 hydrogen                                                                                       ##STR26##         "           "     161                     62 acetyl         "                  "           "     85                      63 "              OCH.sub.2C.sub.3 H.sub.7i                                                                         "           "     72                      64 hydrogen                                                                                       ##STR27##         "           "     30° C.,                                                                 amorphous               65 acetyl                                                                                         ##STR28##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             oil,n .sub.D .sup.2                                                            3 = 1.5113              66 hydrogen       OCH.sub.2C.sub.4 H.sub.9tert.                                                                     "           "     66-68                   67 acetyl         OCH.sub.2C.sub.4 H.sub.9tert.                                                                     "           "     98-99                   68 phenoxy-       OCH.sub.2C.sub.4 H.sub.9tert.                                                                     "           "     128-129                    carbonyl                                                                    69 hydrogen                                                                                       ##STR29##         "           "     46                      70 "              OCH.sub.2CH(C.sub.2 H.sub.5).sub.2                                                                "           "     47-48                   71 "                                                                                              ##STR30##         "           "     n.sub.D.sup.25 =                                                               1.5469                  72 "                                                                                              ##STR31##         "           "                             73 "                                                                                              ##STR32##         "           "                             74 "                                                                                              ##STR33##         "           "     n.sub.D.sup.27 =                                                               1.5459                  75 "                                                                                              ##STR34##         "           "     109-110                 76 acetyl         "                  "           "     68-70                   77 phenoxy-       "                  "           "                                carbonyl                                                                    78 hydrogen       2'-methylphenoxy   "           "     123                     79 acetyl         "                  "           "     91                      80 phenoxycarbonyl                                                                               "                  "           "                             81 hydrogen       2',3'-dimethyl-    "           "     150                                       phenoxy                                                      82 hydrogen       2',4'-dimethyl-    CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             161-163                                   phenoxy                                                      83 acetyl         2',4'-dimethyl-    "           "     81-82                                     phenoxy                                                      84 hydrogen       2',5'-dimethyl-    CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             100-102                                   phenoxy                                                      85 acetyl         2',5'-dimethyl-    "           "     109-110                                   phenoxy                                                      86 hydrogen       3'-methyl-4'-chloro-                                                                              "           "     148                                       phenoxy                                                      87 "              2'-methyl-4'-chloro-                                                                              "           "     146-147                                   phenoxy                                                      88 "              4'-methylphenoxy   "           "     137-139                 89 "              4'-chlorophenoxy   "           "     106                     90 "              3'-methoxyphenoxy  "           "     109                     91 acetyl         "                  "           "     70-71                   92 hydrogen       3'-isopropylphenoxy                                                                               "           "     72                      93 hydrogen       3'-cyanophenoxy    "           "                             94 "              3'-nitrophenoxy    "           "                             95 "              4'-fluorophenoxy   "           "                             96 "              3'-methoxycarbonyl-                                                                               "           "                                               phenoxy                                                      97 "                                                                                              ##STR35##         "           "                             98 "                                                                                              ##STR36##         "           "                             99 "                                                                                              ##STR37##         "           "                             100                                                                               "              OCH.sub.2CO.sub.2 CH.sub.3                                                                        "           "                             101                                                                               "                                                                                              ##STR38##         "           "                             102                                                                               "              cyclopentyloxy     CO.sub.2 CH.sub.3                                                                          CH.sub.3                      103                                                                               "              cyclopentylthio    "           "     92                      104                                                                               hydrogen       cyclooctyloxy      CO.sub.2 CH.sub.3                                                                          CH.sub.3                      105                                                                               "              cyclooctylthio     "           "                             106                                                                               "              cyclohexylthio     "           "     113-114                 107                                                                               "              O(CH.sub.2).sub.2OCH.sub.3                                                                        "           "                             108                                                                               "              O(CH.sub.2).sub.2CN                                                                               "           "                             109                                                                               "                                                                                              ##STR39##         "           "                             110                                                                               "              O(CH.sub.2).sub.2SCH.sub.3                                                                        "           "                             111                                                                               "                                                                                              ##STR40##         "           "                             112                                                                               "                                                                                              ##STR41##         "           "                             113                                                                               "                                                                                              ##STR42##         "           "                             114                                                                               "                                                                                              ##STR43##         -           -                             115                                                                               "                                                                                              ##STR44##         "           "                             116                                                                               "                                                                                              ##STR45##         "           "     119-120                 117                                                                               "                                                                                              ##STR46##         "           "                             118                                                                               "                                                                                              ##STR47##         "           "                             119                                                                               "                                                                                              ##STR48##         "           "                             120                                                                               hydrogen                                                                                       ##STR49##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                      121                                                                               "                                                                                              ##STR50##         "           "     109-110                 122                                                                               "                                                                                              ##STR51##         "           "     53                      123                                                                               "              SCH.sub.2C.sub.3 H.sub.7i                                                                         "           "     92-94                   124                                                                               "              S(CH.sub.2).sub.2C.sub.3 H.sub.7i                                                                 "           "     83-84                   125                                                                               "                                                                                              ##STR52##         "           "     54                      126                                                                               "              SC.sub.7 H.sub.15n "           "     58-60                   127                                                                               "              SC.sub.8 H.sub.17n "           "     54-55                   128                                                                               "                                                                                              ##STR53##         "           "     100-101                 129                                                                               "                                                                                              ##STR54##         "           "     n .sub.D.sup.26 =                                                              1.5195                  130                                                                               "              SCH.sub.2CO.sub.2 Et                                                                              "           "                             131                                                                               "                                                                                              ##STR55##         "           "                             132                                                                               "              thiophenyl         "           "     109-110                 133                                                                               "              2'-methylphenylthio                                                                               "           "                             134                                                                               "              3' -methylphenylthio                                                                              "           "                             135                                                                               "              2'-methoxyphenylthio "                                                                            "                                         136                                                                               "                                                                                              ##STR56##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                      137                                                                               hydrogen                                                                                       ##STR57##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             88-91                   138                                                                               "              OCH.sub.2C.sub.3 H.sub.7i                                                                         CO.sub.2 C.sub.2 H.sub.5                                                                   "                             139                                                                               "              OCH.sub.2C.sub.3 H.sub.7i                                                                         CO.sub.2 C.sub.3 H.sub.7 i                                                                 "                             140                                                                               "              "                  CO.sub.2 CH.sub.2 CH.sub.2Cl                                                               "                             141                                                                               "              "                  CO.sub.2C.sub.2 H.sub.4OCH.sub.3                                                           "                             142                                                                               "              "                                                                                                  ##STR58##  "                             143                                                                               "              "                  COSC.sub.2 H.sub.5                                                                         "                             144                                                                               "              "                  COCH.sub.3  "                             145                                                                               "                                                                                              ##STR59##         "           "                             146                                                                               "              OCH.sub.2 C.sub.4 H.sub.9 tert.                                                                   "           "                             147                                                                               acetyl         OCH.sub.2 C.sub.4 H.sub.9tert.                                                                    COCH.sub.3  CH.sub.3                      148                                                                               hydrogen       "                  COOCH.sub.2 CF.sub.3                                                                       "                             149                                                                               "              OC.sub.4 H.sub.9iso                                                                                ##STR60##  methyl                        150                                                                               "              "                  COOC.sub.2 H.sub.4CN                                                                       "                             151                                                                               "              "                                                                                                  ##STR61##  "                             152                                                                               "              "                  CONHCH.sub.3                                                                               "                             153                                                                               "              "                  CON(CH.sub.3).sub.2                                                                        "                             154                                                                               "              "                  Br          "                             155                                                                               "              "                  CN          "                             156                                                                               H              OC.sub.4 H.sub.9iso                                                                               COCF.sub.3  "                             157                                                                               "              "                  CO.sub.2 CH.sub.3                                                                          C.sub.2 H.sub.5               158                                                                               "              "                  "           C.sub.3 H.sub.7i              159                                                                               "              "                  "                                                                                           ##STR62##                    160                                                                               hydrogen        OC.sub.4 H.sub.9iso                                                                              CO.sub.2 CH.sub.3                                                                          C.sub.4 H.sub.9tert.          161                                                                               "              "                  "           hydrogen                      62 acetyl         "                  "           "                             163                                                                               phenoxycarbonyl                                                                               "                  "           "                             164                                                                               hydrogen       "                  "           methoxy                       165                                                                               "              "                  "           chlorine                      166                                                                               "              "                  "           CF.sub.3                      167                                                                               "              "                  "           CO.sub.2 CH.sub.3             168                                                                               acetyl                                                                                         ##STR63##         "           CH.sub.3                                                                             46                      169                                                                               "                                                                                              ##STR64##         "           "     n .sub.D.sup.25 =                                                              1.5412                  170                                                                               "              OCH(C.sub.2 H.sub.5).sub.2                                                                        "           "     41                      171                                                                               hydrogen       S(CH.sub.2).sub.2OCH.sub.3                                                                        "           "     70-73                   172                                                                               acetyl         thiobenzyl         "           "     92                      173                                                                               phenoxycarbonyl                                                                               "                  "           "     105-107                 174                                                                               acetyl         SC.sub.7 H.sub.15n "           "     55-57                   175                                                                               "              SC.sub.8 H.sub.17n "           "     38-40                   176                                                                               "                                                                                              ##STR65##         "           "     n .sub.D.sup.26 =                                                              1.4875                  177                                                                               "                                                                                              ##STR66##         "           "     67-68                   178                                                                               hydrogen       OC.sub.3 H.sub.7 i CO.sub.2 C.sub.2 H.sub.5                                                                   "     79-80                   179                                                                               phenoxycarbonyl                                                                               SCH.sub.2C.sub.3 H.sub.7i                                                                         CO.sub.2 CH.sub.3                                                                          "     95-96                   180                                                                               hydrogen                                                                                       ##STR67##         "           "     n .sub.D.sup.26 =                                                              1.4912                  181                                                                               acetyl         thiophenyl         CO.sub.2 CH.sub.3                                                                          "     86-88                   182                                                                               acetyl         SC.sub.4 H.sub.9sec.                                                                              CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             76-78                   183                                                                               "                                                                                              ##STR68##         CO.sub.2 CH.sub.3                                                                          "                             184                                                                               "              "                                                                                                  ##STR69##  "                             185                                                                               hydrogen       "                  "           "                             186                                                                               phenoxycarbonyl                                                                               "                  CO.sub.2 CH.sub.3                                                                          "                             187                                                                               "              thiophenyl         "           "     119-121                 188                                                                               "              OCH.sub.2CH(C.sub.2 H.sub.5).sub.2                                                                "           "     87-88                   189                                                                               "              OC.sub.3 H.sub.7i  "           "     75-77                   190                                                                               "                                                                                              ##STR70##         "           "     74-75                   191                                                                               "                                                                                              ##STR71##         "           "     90-91                   192                                                                               hydrogen                                                                                       ##STR72##         "           "     n .sub.D.sup.27 =                                                              1.4902                  193                                                                               acetyl         "                  "           "     72-73                   194                                                                               phenoxycarbonyl                                                                                ##STR73##                     "     n .sub.D.sup.30 =                                                              1.5318                  195                                                                               methoxycarbonyl                                                                               SC.sub.3 H.sub.7 i "           "     87-88                   196                                                                                ##STR74##                                                                                     ##STR75##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             106-108                 197                                                                                ##STR76##     "                  "           "     61-63                   198                                                                                ##STR77##     "                  "           "     124                     199                                                                               HCCCH.sub.2OCO OC.sub.4 H.sub.9iso                                                                               "           "                             200                                                                               n-C.sub.3 H.sub.7OCO                                                                          "                  "           "                             201                                                                               n-C.sub.4 H.sub.9OCO                                                                          OC.sub.4 H.sub.9iso                                                                               CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             51                      202                                                                               CH.sub.3 O(CH.sub.2).sub.2CCO                                                                 "                  "           "     59                      203                                                                               Cl(CH.sub.2).sub.2CCO                                                                         "                  "           "     63-64                   204                                                                               CH.sub.3SCO    "                  "           "     n .sub.D.sup.26 =                                                              1.5260                  205                                                                               n-C.sub.3 H.sub.7SCO                                                                          "                  "           "     n .sub.D.sup.26 =                                                              1.5171                  206                                                                               tert.C.sub.4 H.sub.9OCO                                                                       "                  "           "                             207                                                                               tert.C.sub.4 H.sub.9SCO                                                                       "                  "           "                             208                                                                                ##STR78##     "                  "           "                             209                                                                                ##STR79##     "                  "           "                             210                                                                               PhSCO          "                  "           "                             211                                                                                ##STR80##     "                  "           "     142                     212                                                                                ##STR81##     OC.sub.4 H.sub.9iso                                                                               CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             75                      213                                                                                ##STR82##                                                                                     ##STR83##         "           "     112-113                 214                                                                                ##STR84##     OC.sub.4 H.sub.9iso                                                                               "           "     96-97                   215                                                                               H . HCl                                                                                        ##STR85##         "           "     157-158                 216                                                                                ##STR86##                                                                                     ##STR87##         "           "     112-113                 217                                                                                ##STR88##                                                                                     ##STR89##         "           "     84                      218                                                                                ##STR90##                                                                                     ##STR91##         "           "     86-88                   219                                                                                ##STR92##                                                                                     ##STR93##         "           "     102-103                 220                                                                               H                                                                                              ##STR94##         CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             157-158                 221                                                                                ##STR95##                                                                                     ##STR96##         CO.sub.2 CH.sub.3                                                                          "     40-41                   222                                                                               CHO                                                                                            ##STR97##         "           "     105-106                 223                                                                                ##STR98##                                                                                     ##STR99##         "           "     105-107                 224                                                                                ##STR100##                                                                                    ##STR101##        "           "     89                      225                                                                               H                                                                                              ##STR102##        "           "     139-141                 226                                                                               H                                                                                              ##STR103##        "           "     71-74                   227                                                                               H                                                                                              ##STR104##        "           "     52-53                   228                                                                               3'-chlorophenoxy- carbonyl                                                                     ##STR105##        "           "     110                     229                                                                               2'-chloro-4'-nitro-                                                                           OCH.sub.2C.sub.3 H.sub.7i                                                                         "           "     81                         phenoxycarbonyl                                                             230                                                                               2',4',5'-trichloro- phenoxycarbonyl                                                            ##STR106##        "           "     79-82                   231                                                                               2',4',5'-trichloro-               OCH.sub.2C.sub.3 H.sub.7i                                                                  " "   70-72                      phenoxycarboxyl                                                             232                                                                               2'-sec.-C.sub.4 H.sub.9phenoxy-                                                               OCH.sub.2C.sub.4 H.sub.9tert.                                                                     "           "     n .sub.D.sup.20 =                                                              1.5063                     carbonyl                                                                    233                                                                               2'-ethylphenoxy- carbonyl                                                                      ##STR107##        "           "     oil                     234                                                                               "                                                                                              ##STR108##        "           "     90-92                   235                                                                               2'-chloro-4',  OCH.sub.2C.sub.3 H.sub.7i                                                                         CO.sub.2 CH.sub.3                                                                          CH.sub.3                                                                             125-127                    5'-dimethyl-   dimethyl-                                                       phenoxycarbonyl                                                             236                                                                               4'-sec-butyl- phenoxycarbonyl                                                                  ##STR109##        "           "     oil                     237                                                                               2'-sec-butyl-  SCH.sub.2C.sub.3 H.sub.7i                                                                         "           "     oil                        phenoxycarbonyl                                                             238                                                                               2',3',5',6'-tetra-                                                                            OC.sub.3 H.sub.7 i "           "     142-145                    methylphenoxy-                                                                 carbonyl                                                                    239                                                                               2'-chloro-4'-nitro-                                                                           OC.sub.4 H.sub.9sec.                                                                              "           "     97-98                      phenoxycarbonyl                                                             240                                                                               H                                                                                              ##STR110##        "           "     148-149                 241                                                                               H                                                                                              ##STR111##        "           "     111-113                 242                                                                               CH.sub.3CO     "                  "           "     53                      243                                                                               H                                                                                              ##STR112##        "           "     127-128                 244                                                                               CH.sub.3CO     "                  "           "     59-60                   245                                                                               CH.sub.3 CO                                                                                    ##STR113##        "           "                             246                                                                               CH.sub.3CO                                                                                     ##STR114##        "           "                             247                                                                               H              SC.sub.4 H.sub.9 tert.                                                                            "           "     96-98                   248                                                                               H                                                                                              ##STR115##        COOCH.sub.3 "     87-89                   249                                                                                ##STR116##    "                  "           "      99-100                 __________________________________________________________________________

The active ingredients according to the invention may be applied for instance in the form of directly sprayable solutions, powders, suspensions (including high-percentage aqueous, oily or other suspensions), dispersions, emulsions, oil dispersions, pastes, dusts, broadcasting agents, or granules by spraying, atomizing, dusting, broadcasting or watering. The forms of application depend entirely on the purpose for which the agents are being used; in any case they should ensure a fine distribution of the active ingredient.

For the preparation of solutions, emulsions, pastes and oil dispersions to be sprayed direct, mineral oil fractions of medium to high boiling point, such as kerosene or diesel oil, further coal-tar oils, and oils of vegetable or animal origin, aliphatic, cyclic and aromatic hydrocarbons such as benzene, toluene, xylene, paraffin, tetrahydronaphthalene, alkylated naphthalenes and their derivatives such as methanol, ethanol, propanol, butanol, chloroform, carbon tetrachloride, cyclohexanol, cyclohexanone, chlorobenzene, isophorone, etc., and strongly polar solvents such as dimethylformamide, dimethylsulfoxide, N-methylpyrrolidone, water, etc. are suitable.

Aqueous formulations may be prepared from emulsion concentrates, pastes, oil dispersions or wettable powders by adding water. To prepare emulsions, pastes and oil dispersions the ingredients as such or dissolved in an oil or solvent may be homogenized in water by means of wetting or dispersing agents, adherents or emulsifiers. Concentrates which are suitable for dilution with water may be prepared from active ingredient, wetting agent, adherent, emulsifying or dispersing agent and possibly solvent or oil.

Examples of surfactants are: alkali metal, alkaline earth metal and ammonium salts of ligninsulfonic acid, naphthalenesulfonic acids, phenolsulfonic acids, alkylaryl sulfonates, alkyl sulfates, and alkyl sulfonates, alkali metal and alkaline earth metal salts of dibutylnaphthalenesulfonic acid, lauryl ether sulfate, fatty alcohol sulfates, alkali metal and alkaline earth metal salts of fatty acids, salts of sulfated hexadecanols, heptadecanols, and octadecanols, salts of sulfated fatty alcohol glycol ethers, condensation products of sulfonated naphthalene and naphthalene derivatives with formaldehyde, condensation products of naphthalene or naphthalenesulfonic acids with phenol and formaldehyde, polyoxyethylene octylphenol ethers, ethoxylated isoocytylphenol, ethoxylated octylphenol and ethoxylated nonylphenol, alkylphenol polyglycol ethers, tributylphenyl polyglycol ethers, alkylaryl polyether alcohols, isotridecyl alcohol, fatty alcohol ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers, ethoxylated polyoxypropylene, lauryl alcohol polyglycol ether acetal, sorbitol esters, lignin, sulfite waste liquors and methyl cellulose.

Powders, dusts and broadcasting agents may be prepared by mixing or grinding the active ingredients with a solid carrier.

Granules, e.g., coated, impregnated or homogeneous granules, may be prepared by bonding the active ingredients to solid carriers. Examples of solid carriers are mineral earths such as silicic acid, silica gels, silicates, talc, kaolin, Attaclay, limestone, lime, chalk, bole, loess, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide, ground plastics, fertilizers such as ammonium sulfate, ammonium phosphate, ammonium nitrate, and ureas, and vegetable products such as grain flours, bark meal, wood meal, and nutshell meal, cellulosic powders, etc.

The formulations contain from 0.1 to 95, and preferably 0.5 to 90, % by weight of active ingredient.

EXAMPLE 5

90 parts by weight of compound 1 is mixed with 10 parts by weight of N-methyl-α-pyrrolidone. A mixture is obtained which is suitable for application in the form of very fine drops.

EXAMPLE 6

20 parts by weight of compound 2 is dissolved in a mixture consisting of 80 parts by weight of xylene, 10 parts by weight of the adduct of 8 to 10 moles of ethylene oxide to 1 mole of oleic acid-N-monoethanolamide, 5 parts by weight of the calcium salt of dodecylbenzenesulfonic acid, and 5 parts by weight of the adduct of 40 moles of ethylene oxide to 1 mole of castor oil. By pouring the solution into 100,000 parts by weight of water and uniformly distributing it therein, an aqueous dispersion is obtained containing 0.02% by weight of the active ingredient.

EXAMPLE 7

20 parts by weight of compound 3 is dissolved in a mixture consisting of 40 parts by weight of cyclohexanone, 30 parts by weight of isobutanol, 20 parts by weight of the adduct of 7 moles of ethylene oxide to 1 mole of isooctylphenol, and 10 parts by weight of the adduct of 40 moles of ethylene oxide to 1 mole of castor oil. By pouring the solution into 100,000 parts by weight of water and finely distributing it therein, an aqueous dispersion is obtained containing 0.02% by weight of the active ingredient.

EXAMPLE 8

20 parts by weight of compound 1 is dissolved in a mixture consisting of 25 parts by weight of cyclohexanol, 65 parts by weight of a mineral oil fraction having a boiling point between 210° and 280° C., and 10 parts by weight of the adduct of 40 moles of ethylene oxide to 1 mole of castor oil. By pouring the solution into 100,000 parts by weight of water and uniformly distributing it therein, an aqueous dispersion is obtained containing 0.02% by weight of the active ingredient.

EXAMPLE 9

20 parts by weight of compound 2 is well mixed with 3 parts by weight of the sodium salt of diisobutylnaphthalene-α-sulfonic acid, 17 parts by weight of the sodium salt of a lignin-sulfonic acid obtained from a sulfite waste liquor, and 60 parts by weight of powdered silica gel, and triturated in a hammer mill. By uniformly distributing the mixture in 20,000 parts by weight of water, a spray liquor is obtained containing 0.1% by weight of the active ingredient.

EXAMPLE 10

3 parts by weight of compound 3 is intimately mixed with 97 parts by weight of particulate kaolin. A dust is obtained containing 3% by weight of the active ingredient.

EXAMPLE 11

30 parts by weight of compound 4 is intimately mixed with a mixture consisting of 92 parts by weight of powdered silica gel and 8 parts by weight of paraffin oil which has been sprayed onto the surface of this silica gel. A formulation of the active ingredient is obtained having good adherence.

EXAMPLE 12

40 parts by weight of compound 1 is intimately mixed with 10 parts of the sodium salt of a phenolsulfonic acid-urea-formaldehyde condensate, 2 parts of silica gel and 48 parts of water. Dilution in 100,000 parts by weight of water gives an aqueous dispersion containing 0.04 wt% of active ingredient.

EXAMPLE 13

20 parts of compound 2 is intimately mixed with 2 parts of the calcium salt of dodecylbenzenesulfonic acid, 8 parts of a fatty alcohol polyglycol ether, 2 parts of the sodium salt of a phenolsulfonic acid-urea-formaldehyde condensate and 68 parts of a paraffinic mineral oil. A stable oily dispersion is obtained.

The new compounds are herbicidally effective, and are suitable for removing or suppressing unwanted plant growth in crops or on uncultivated land. It goes of course without saying that the intensity of action varies from compound to compound, or the action of the compounds on unwanted plants or crop plants varies. The influence of the compounds on unwanted plants is shown in the following tables, which contain results from greenhouse experiments.

The vessels employed were plastic flowerpots having a volume of 300 cm³, and which were filled with a sandy loam containing about 1.5% humus. The seeds of the test plants (cf. Table 1) were sown shallow, and separately, according to species. For the preemergence treatment, the active ingredients were applied to the surface of the soil immediately after the seeds had been sown. The compounds were emulsified or suspended in water as vehicle, and sprayed through finely distributing nozzles. After the agents had been applied, the vessels were lightly sprinkler-irrigated to induce germination and growth and to activate the chemical agents. Transparent plastic covers were then placed on the vessels until the plants had taken root. The cover ensured uniform germination of the plants, insofar as this was not impaired by the chemicals, and prevented readily volatile active ingredients from evaporating.

For postemergence treatment, the plants were first grown to a height of 3 to 10 cm, depending on the growth shape, before being treated. The vessels were not covered after treatment. The pots were set up in the greenhouse--species from warmer areas at from 25° to 40° C., and species from moderate climates at 15° to 30° C. The experiments were run for from 4 to 6 weeks. During this period, the plants were tended and their reactions to the various treatments assessed. The following tables contain the compounds investigated, the application rates in kg/ha of active ingredient, and the plants used for the tests. The scale used for assessment was 0 to 100, 0 denoting no damage or normal emergence, and 100 denoting nonemergence or complete destruction of at least the visible plant parts.

RESULTS

The new pyrazole(thio)-ether derivatives exhibit interesting herbicidal properties in both pre- and postemergence use. They act on both broadleaved and grassy unwanted plants, and cause no damage to certain crop plants although they come into direct contact with the active ingredients. The compounds are used in the main after emergence of the unwanted plants, regardless of whether crop plants are growing on the treated areas or not.

If the crop plants tolerate the active ingredients less well, application techniques may be used in which the agents are sprayed from suitable equipment in such a manner that the leaves of sensitive crop plants are if possible not touched, and the agents reach the soil or the unwanted plants growing beneath the crop plants (post-directed, lay-by treatment).

The broad range of combatable species from the most widely varying botanical families also makes the agents suitable for removing unwanted grass and weeds from tree and bush plantations and sugarcane.

The active ingredients may also be used on non-crop areas such as railroad track and industrial units, parking lots, storage spaces, pathways, edges of ditches, and cut-over land. Whether the plants are completely eliminated or their growth is merely suppressed and kept under control without killing them is a question of dosage amounts.

Some of the compounds are also suitable as desiccants for green leaves and stems. Such agents are used for instance for killing off potato tops before the potatoes are mechanically harvested; for combating weeds in ripe cereal fields prior to harvesting; for accelerating drying in soybeans before combine harvesting; and for removing green plant parts in cotton ready for picking.

In view of the many application methods possible, the agents according to the invention, or mixtures containing them, may be used not only on the crop plants listed in the tables, but also in a much larger range of crops for removing unwanted plants. Depending on the object to be achieved, the application rates vary from 0.1 to 15 kg/ha and more.

The following crop plants may be mentioned by way of example:

    ______________________________________                                         Botanical name   Common name                                                   ______________________________________                                         Allium cepa      onions                                                        Ananas comosus   pineapples                                                    Arachis hypogaea peanuts (groundnuts)                                          Asparagus officinalis                                                                           asparagus                                                     Avena sativa     oats                                                          Beta vulgaris spp. altissima                                                                    sugarbeets                                                    Beta vulgaris spp. rapa                                                                         fodder beets                                                  Beta vulgaris spp. esculenta                                                                    table beets, red beets                                        Brassica napus var. napus                                                                       rape                                                          Brassica napus var. napobrassica                                               Brassica napus var. rapa                                                                        turnips                                                       Brassica rapas var. silvestris                                                 Camellia sinensis                                                                               tea plants                                                    Carthamus tinctorius                                                                            safflower                                                     Citrus limon     lemons                                                        Citrusmaxima     grapefruits                                                   Citrus reticulata                                                              Citrus sinensis  orange trees                                                  Coffea arabica                                                                 (Coffea canephora,                                                             Coffea liberica) coffee plants                                                 Cucumis melo     melons                                                        Cucumis sativus  cucumbers                                                     Cynodon dactylon Bermudagrass in turf and lawns                                Daucus carota    carrots                                                       Elais guineensis oil palms                                                     Fragaria vesca   strawberries                                                  Glycine max      soybeans                                                      Gossypium hirsutum                                                             (Gossypium arboreum                                                                             cotton                                                        Gossypium herbaceum                                                            Gossypium vitifolium)                                                          Helianthus annus sunflowers                                                    Helianthus tuberosus                                                           Hevea brasiliensis                                                                              rubber plants                                                 Hordeum vulgare  barley                                                        Humulus lupulus  hops                                                          Ipomoea batatas  sweet potatoes                                                Lactuca sativa   lettuce                                                       Lens culinaris   lentils                                                       Linum usitatissimum                                                                             flax                                                          Lycopersicon lycopersicum                                                                       tomatoes                                                      Malus spp.       apple trees                                                   Manihot esculenta                                                                               cassava                                                       Medicago sativa  alfalfa (lucerne)                                             Mentha piperita  peppermint                                                    Musa spp.        banana plants                                                 Nicothiana tabacum                                                                              tobacco                                                       (N. rustica)                                                                   Olea europaea    olive trees                                                   Oryza sativa     rice                                                          Panicum miliaceum                                                              Phaseolus lunatus                                                                               limabeans                                                     Phaseolus mungo  mungbeans                                                     Phaseolus vulgaris                                                                              snapbeans, green beans,                                                        dry beans                                                     Pennisetum glaucum                                                             Petroselinum crispum                                                                            parsley                                                       spp. tuberosum                                                                 Picae abies      Norway spruce                                                 Pinus spp.       pine trees                                                    Pisum sativum    English peas                                                  Prunus avium     cherry trees                                                  Prunus domestica plum trees                                                    Prunus persica   peach trees                                                   Pyrus communis   pear trees                                                    Ribes sylvestre  redcurrants                                                   Ribes uva-crispa                                                               Ricinus communis                                                               Saccharum officinarum                                                                           sugar cane                                                    Secale cereale   rye                                                           Sesamum indicum  sesame                                                        Solanum tuberosum                                                                               Irish potatoes                                                Sorghum bicolor (s. vulgare)                                                                    grain sorghum                                                 Sorghum dochna                                                                 Spinacia oleracea                                                                               spinach                                                       Theobroma cacao  cacao plants                                                  Trifolium pratense                                                                              red clover                                                    Triticum aestivum                                                                               wheat                                                         Vaccinium corymbosum                                                                            blueberries                                                   Vaccinium vitis-idaea                                                                           cranberries                                                   Vicia faba       tick beans                                                    Vigna sinensis (V. unguiculata)                                                                 cow peas                                                      Vitis vinifera   grapes                                                        Zea mays         Indian corn, sweet corn, maize                                ______________________________________                                    

The compounds according to the invention may also be mixed or combined with numerous other herbicides or growth-regulating compounds in order to further extend the spectrum of action, to achieve synergistic effects, or to improve persistence in the soil. Depending on the area treated and the objective, the following compounds, or similar derivatives, may be admixed:

    ______________________________________                                          ##STR117##                                                                    R               R.sup.1       R.sup.2                                          ______________________________________                                          ##STR118##     NH.sub.2      Cl                                                ##STR119##     NH.sub.2      Br                                                ##STR120##     OCH.sub.3     OCH.sub.3                                         ##STR121##     OCH.sub.3     OCH.sub.3                                         ##STR122##     NH.sub.2      Cl                                                ##STR123##     NHCH.sub.3    Cl                                                ##STR124##     NH.sub.2      Br                                                ##STR125##     NH . CH.sub.3 Cl                                                ##STR126##                                                                    R            R.sup.1     R.sup.2                                               ______________________________________                                                       ##STR127## H         (salts)                                     H                                                                                            ##STR128## CH.sub.3  (salts)                                     H                                                                                            ##STR129## Cl        (salts)                                     H                                                                                            ##STR130## F         (salts)                                     CH.sub.2 OCH.sub.3                                                                           ##STR131## F                                                     CH.sub.2 OCH.sub.3                                                                           ##STR132## H                                                     CN                                                                                           ##STR133## H                                                     CN                                                                                           ##STR134## Cl                                                    CN                                                                                           ##STR135## F                                                     CH.sub.2 N.sub.3                                                                             ##STR136## H                                                      ##STR137##                                                                     ##STR138##                                                                    R     R.sup.1   R.sup.2                                                                               R.sup.3     R.sup.4                                     ______________________________________                                         H     F.sub.3 C H      C.sub.2 H.sub.5                                                                            C.sub.4 H.sub.9                             H     F.sub.3 C H      n . C.sub.3 H.sub.7                                                                        n . C.sub.3 H.sub.7                         H     F.sub.3 C H      CH.sub.2CH.sub.2 Cl                                                                        n . C.sub.3 H.sub. 7                        H     SO.sub.2 NH.sub.2                                                                        H      n . C.sub.3 H.sub.7                                                                        n . C.sub.3 H.sub.7                         H     F.sub.3 C H      nC.sub.3 H.sub.7                                                                            ##STR139##                                 H.sub.3 C                                                                            H.sub.3 C H      H                                                                                           ##STR140##                                  ##STR141##                                                                    R               R.sup.1                                                                               R.sup.2                                                 ______________________________________                                          ##STR142##     H      iC.sub.3 H.sub.7                                        CH.sub.3        H                                                                                      ##STR143##                                              ##STR144##     H                                                                                      ##STR145##                                              ##STR146##     H      iC.sub.3 H.sub.7                                         ##STR147##     H                                                                                      ##STR148##                                              ##STR149##     H      CH.sub.3                                                 ##STR150##                                                                     ##STR151##     H      C.sub.2 H.sub.5                                          ##STR152##     H      C.sub.2 H.sub.5                                          ##STR153##     H      CH.sub.3                                                 ##STR154##     H      C.sub.2 H.sub.5                                          ##STR155##     CH.sub.3                                                                              CH.sub.3                                                 ##STR156##     H      CH.sub.3                                                 ##STR157##                                                                    R           R.sup.1     R.sup.2                                                ______________________________________                                         iC.sub.3 H.sub.7                                                                           iC.sub.3 H.sub.7                                                                           CH.sub.2CClCCl.sub.2                                   iC.sub.3 H.sub.7                                                                           iC.sub.3 H.sub.7                                                                           CH.sub.2CClCHCl                                        n . C.sub.3 H.sub.7                                                                        n . C.sub.3 H.sub.7                                                                        C.sub.2 H.sub.5                                         ##STR158##                                                                    R                 X      Y      R.sup.1                                        ______________________________________                                         CH.sub.3          Cl     Cl     Na                                             Cl                Cl     Cl     Na                                              ##STR159##       H      CH.sub.3                                                                              CH.sub.3                                        ##STR160##       H      CH.sub.3                                                                               ##STR161##                                     ##STR162##       H      CH.sub.3                                                                              Na                                              ##STR163##       H      CH.sub.3                                                                              Na                                              ##STR164##       H      CH.sub.3                                                                              CH.sub.3                                        ##STR165##                                                                    R           R.sup.1         R.sup.2                                            ______________________________________                                          ##STR166## H                                                                                               ##STR167##                                         ##STR168## H               C.sub.2 H.sub.5                                     ##STR169##                                                                                 ##STR170##     CH.sub.2 Cl                                         ##STR171##                                                                                 ##STR172##     CH.sub.2 Cl                                         ##STR173## CH.sub.2 OCH.sub.3                                                                             CH.sub.2 Cl                                         ##STR174##                                                                                 ##STR175##     CH.sub.2 Cl                                         ##STR176## iC.sub.3 H.sub.7                                                                               CH.sub.2 Cl                                         ##STR177## CH.sub.2CH.sub.2OCH.sub.3                                                                      Cl.sub.2 Cl                                        C.sub.2 H.sub.5                                                                            C.sub.2 H.sub.5                                                                                 ##STR178##                                         ##STR179## H                                                                                               ##STR180##                                         ##STR181## H               CH.sub.3                                            ##STR182##                                                                                 ##STR183##     CH.sub.2 Cl                                         ##STR184##                                                                                 ##STR185##     CH.sub.2 Cl                                         ##STR186##                                                                                 ##STR187##     CH.sub.2 Cl                                         ##STR188## H               CH.sub.3                                            ##STR189##                                                                                 ##STR190##     CH.sub.2 Cl                                         ##STR191##                                                                                 ##STR192##     CH.sub.2 Cl                                         ##STR193##                                                                                 ##STR194##     CH.sub.2 Cl                                         ##STR195##                                                                    R       R.sup.1   X         R.sup.2                                                                              R.sup.3                                      ______________________________________                                         H       C.sub.2 H.sub.5                                                                          SCH.sub.3 H     C.sub.2 H.sub.5                              H       iC.sub.3 H.sub.7                                                                         SCH.sub.3 H     C.sub.2 H.sub.5                              H       iC.sub.3 H.sub.7                                                                         Cl        H     C.sub.2 H.sub.5                              H       iC.sub.3 H.sub.7                                                                         Cl        H                                                                                     ##STR196##                                  H       C.sub.2 H.sub.5                                                                          Cl        H     C.sub.2 H.sub.5                              H       C.sub.2 H.sub.5                                                                          Cl        H                                                                                     ##STR197##                                  H       iC.sub.3 H.sub.7                                                                         OCH.sub.3 H     iC.sub.3 H.sub.7                              ##STR198##                                                                    X        Y       R                                                             ______________________________________                                         Br       Br      H                (salts)                                      I        I       H                (salts)                                      Br       Br                                                                                      ##STR199##                                                    ##STR200##                                                                     ##STR201##                                                                     ##STR202##                                                                    R               R.sup.1                                                                               R.sup.2                                                                               R.sup.3                                          ______________________________________                                          ##STR203##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR204##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR205##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR206##     H      H                                                                                      ##STR207##                                       ##STR208##     CH.sub.3                                                                              CH.sub.3                                                                              H                                                 ##STR209##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR210##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR211##     H      CH.sub.3                                                                               ##STR212##                                       ##STR213##     H      CH.sub.3                                                                              OCH.sub.3                                         ##STR214##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR215##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR216##     H      CH.sub.3                                                                              OCH.sub.3                                         ##STR217##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR218##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR219##     H      CH.sub.3                                                                              OCH.sub.3                                         ##STR220##     H      CH.sub.3                                                                              H                                                 ##STR221##     CH.sub.3                                                                              CH.sub.3                                                                              H                                                 ##STR222##     CH.sub.3                                                                              CH.sub.3                                                                              H                                                 ##STR223##     H      C.sub.2 H.sub.5                                                                       C.sub.2 H.sub.5                                   ##STR224##     H      CH.sub.3                                                                              CH.sub.3                                          ##STR225##                                                                     ##STR226##                                                                    R           R.sup.1   R.sup.2  R.sup.3                                         ______________________________________                                         Cl          CF.sub.3  H        COOH salts                                      Cl          Cl        H        H                                               Cl          Cl        H                                                                                        ##STR227##                                     H           CF.sub.3  Cl       OC.sub.2 H.sub.5                                 ##STR228##                                                                     ##STR229##                                                                    R                R.sup.1     R.sup.2                                           ______________________________________                                         tert.-C.sub. 4 H.sub.9                                                                          NH.sub.2    SCH.sub.3                                          ##STR230##      NH.sub.2    CH.sub.3                                           ##STR231##      NH.sub.2    SCH.sub.3                                          ##STR232##                                                                     ##STR233##                                                                    R          R.sup.1    R.sup.2   R.sup.3                                        ______________________________________                                         H          CH.sub.3   Br                                                                                        ##STR234##                                    H          CH.sub.3   Br        iC.sub.3 H.sub.7                               H          CH.sub.3   Cl        tert.-C.sub.4 H.sub.9                          H          CH.sub.3   Cl                                                                                        ##STR235##                                     ##STR236##                                                                     ##STR237##                                                                    X         Y                  R                                                 ______________________________________                                         CF.sub.3  H                  CH.sub.3                                          H         F                  CH.sub.3                                           ##STR238##                                                                     ##STR239##                                                                     ##STR240##                                                                     ##STR241##                                                                    R               R.sup.1   R.sup.2                                              ______________________________________                                          ##STR242##     CH.sub.3  H        salts, esters, amides                        ##STR243##     H         H        salts, esters, amides                        ##STR244##                                                                    R               R.sup.1                                                        ______________________________________                                          ##STR245##     H            salts, esters, amides                              ##STR246##     H            salts, esters, amides                              ##STR247##                                                                     ##STR248##                                                                     ##STR249##                                                                    R     R.sup.1                                                                               R.sup.2 R.sup.3                                                                               R.sup.4                                            ______________________________________                                         H     Cl     NH.sub.2                                                                               Cl     H          salts,                                                                         esters,                                                                        amides                                  Cl    Cl     H       Cl     Na                                                 Cl    H      Cl      OCH.sub.3                                                                             H          salts,                                                                         esters,                                                                        amides                                  Cl    Cl     H       Cl     H . (CH.sub.3).sub.2 NH                             ##STR250##                                                                    R              R.sup.1    R.sup.2                                              ______________________________________                                          ##STR251##    CH.sub.3   H       salts, esters, amides                         ##STR252##    H          H       salts, esters, amides                         ##STR253##    H          H       salts, esters, amides                         ##STR254##    H          H       salts, esters, amides                         ##STR255##    CH.sub.3   H       salts, esters, amides                         ##STR256##                                                                     ##STR257##                                                                     ##STR258##                                                                     ##STR259##                                                                     ##STR260##                                                                     ##STR261##                                                                    R               R.sup.1       R.sup.2                                          ______________________________________                                         COOCH.sub.3     COOCH.sub.3   Cl                                                ##STR262##                                                                     ##STR263##                                                                     ##STR264##                                                                     ##STR265##                                                                     ##STR266##                                                                    R               R.sup.1       R.sup.2                                          ______________________________________                                         OH              CH.sub.3      Na                                               CH.sub.3        CH.sub.3      Na                                               CH.sub.3        CH.sub.3      OH                                               ONa             CH.sub.3      Na                                                ##STR267##                                                                     ##STR268##                                                                     ##STR269##                                                                     ##STR270##                                                                     ##STR271##                                                                     ##STR272##                                                                     ##STR273##                                                                     ##STR274##                                                                     ##STR275##                                                                    NH.sub.4 SCN                                                                    ##STR276##                                                                     ##STR277##                                                                     ##STR278##                                                                     ##STR279##                                                                     ##STR280##                                                                     ##STR281##                                                                     ##STR282##                                                                     ##STR283##                                                                     ##STR284##                                                                     ##STR285##                                                                     ##STR286##                                                                     ##STR287##                                                                    ______________________________________                                    

It may also be useful to apply the new compounds, either alone or in combination with other herbicides, in admixture with other crop protection agents, e.g., agents for combating pests or phytopathogenic fungi or bacteria. The compounds may also be mixed with solutions of mineral matters used to remedy nutritional or trace element deficiencies.

Under certain circumstances, it may also be advantageous to apply the agents, either alone or in the above combinations, in admixture with commercially available solid or liquid mineral fertilizers.

                                      TABLE 1                                      __________________________________________________________________________     List of plant names                                                                         Abbreviation in                                                   Botanical name                                                                              tables     Common name                                            __________________________________________________________________________     Abutilon theophrasti                                                                        Abut. theo.                                                                               velvet leaf                                            Amaranthus retroflexus                                                                      Amar. ret. redroot pigweed                                        Arachys hypogaea                                                                            Arachys hyp.                                                                              peanuts (groundnuts)                                   Avena fatua  Avena fatua                                                                               wild oats                                              Centaurea cyanus                                                                            Centaurea cyanus                                                                          cornflower                                             Chenopodium album                                                                           Chenopodium album                                                                         lambsquarters                                          Chrysanthemum segetum                                                                       Chrys. seg.                                                                               corn marigold                                          Echinochloa crus galli                                                                      Echin. c.g.                                                                               barnyardgrass                                          Eleusine indica                                                                             Eleus. ind.                                                                               goosegrass                                             Euphorbia geniculata                                                                        Euph. genic.                                                                              South American member of                                                       the spurge family                                      Ipomoea spp. Ipomoea spp.                                                                              morningglory                                           Lolium multiflorum                                                                          Lolium mult.                                                                              annual ryegrass                                        Sesbania exaltata                                                                           Sesbania exaltata                                                                         hemp sesbania (coffeeweed)                             Sinapis alba Sinapis alba                                                                              white mustard                                          Sorghum bicolor                                                                             Sorghum bicolor                                                                           sorghum                                                Stellaria media                                                                             Stellaria media                                                                           chickweed                                              Triticum aestivum                                                                           Triticum aestivum                                                                         wheat                                                  Zea mays     Mais       Indian corn                                            Lamium amplexicaule                                                                         Lamium amplex.                                                                            henbit                                                 Lamium spp.  Lamium spp.                                                                               dead nettle                                            Solanum nigrum                                                                              Solanum nigrum                                                                            black nightshade                                       Gossypium hirsutum                                                                          Gossypium hirsutum                                                                        cotton                                                 __________________________________________________________________________

                                      TABLE 2                                      __________________________________________________________________________     Selective control of Avena fatua and other weeds in wheat; postemergence       treatment in the greenhouse                                                                                  Test plants and % damage                                                       Triticum                                                                            Avena                                                                              Chenopodium                                                                           Stellaria                        Compound no.              kg/ha                                                                              aestivum                                                                            fatua                                                                              album  media                            __________________________________________________________________________     90                        0.5 0    80  98     95                                                         1.0 --   100 98     100                                                        2.0 0    100 --     100                              49                        0.5 0    80  98     100                                                        1.0 --   85  98     100                                                        2.0 0    100 --     100                              51                        0.5 0    50  98     100                                                        1.0 --   95  98     100                                                        2.0 0    95  --     100                                       ##STR288##       0.5 1.0 2.0                                                                        6 16 28                                                                             33 56 72                                                                           -- -- --                                                                              18 20 35                                 prior art                                                              __________________________________________________________________________      0 = no damage, 100 = plants withered                                     

                                      TABLE 3                                      __________________________________________________________________________     Selective control of unwanted plants in groundnuts; postemergence              treatment in the greenhouse                                                                       Test plants and % damage                                                       Arachys                                                                             Amar.                                                                              Abut.                                                                              Chrys.                                                                             Echin.                                                                             Eleu.                                                                              Euph.                                                                              Ipomoea                                                                             Sesbania                  Compound no.   kg/ha                                                                              hyp. ret.                                                                               theo.                                                                              seg.                                                                               c.g ind.                                                                               genic.                                                                             spp. exaltata                  __________________________________________________________________________     40             0.5  5   100 100 100 100  98 100  92  100                                      1.0  5   100 100 100 100 100 100  92  100                                      2.0 10   100 --  100 100 --  100 100  100                       57             0.5  0   100 100 --  100  80 100 100  100                                      1.0  0   100 100 --  100  95 100 100  100                                      2.0  0   100 --  --  100 --  100 100  100                       64             0.5  0   --  --  --   92 --  --   72  100                                      1.0  0    90 --  --  100 --  --   72  100                                      2.0  0   --  --  --  100 --  --  100   --                       76             0.5  0   100 100 100 100 100  98  75  100                                      1.0  2   100 100 100 100 100 100  75  100                                      2.0 10   100 --  100 100 --  100 100  100                       44             0.5  5    50 100 100  90 100 100  90  100                                      1.0  5   100 100 100 100 100 100  92  100                                      2.0 10   100 --  100 100 --  100 100  100                       12             0.5  5   100 100 100  99 100 100  85  100                                      1.0  5   100 100 100 100 100 100 100  100                                      2.0 --   100 --  100 100 --  100 100  100                       53             0.5  0   100  98 --  100 --  --  100  100                                      1.0  0   100 100 --  100 --  --  100  100                                      2.0 --   --  --  --  100 --  --  100  --                        50             0.5  0   100  65 100  99  85  98  92  100                                      1.0  0   100 100 100 100 100 100 100  100                                      2.0 10   100 --  100 100 --  100 --   100                       10             0.5  0   100 100 100 100  98 100 100  100                                      1.0  5   100 100 100 100 100 100 100  100                                      2.0  0   100 --  100 100 --  100 100  100                       63             0.5  5   100 100 100 100 100 100  98  100                                      1.0  5   100 100 100 100 100 100  98  100                                      2.0 10   100 --  100 100 --  100 100  100                        ##STR289##    1.0  0 0  10 20                                                                             -- --                                                                              -- --                                                                               20 --                                                                             -- --                                                                               20 20                                                                              0 0  0 0                      prior art                                                                      (DE-OS 2,513,750)                                                               ##STR290##    1.0 2.0                                                                             0 0  70 100                                                                            100 100                                                                            100 100                                                                             0 0                                                                               -- --                                                                               33 37                                                                              43 55                                                                               80 98                    prior art                                                                      (German 1,542,836)                                                             __________________________________________________________________________      0 = no damage, 100 = plants withered                                     

                                      TABLE 4                                      __________________________________________________________________________     Removal of unwanted plants in sorghum and Indian corn;                         postemergence treatment                                                                    Test plants and % damage                                                       Sorghum                                                                             Zea                                                                               Centaurea                                                                            Chenopodium                                                                           Sesbania                                                                            Sinapis                                  Compound no.                                                                           kg/ha                                                                              bicolor                                                                             mays                                                                              cyanus                                                                               album  exaltata                                                                            alba                                     __________________________________________________________________________     7       0.25                                                                               0    12 95    95     97   --                                               0.5 10   17 98    100    97   100                                              1.0 --   -- 98    100    100  100                                      44      0.5 15   15 98    100    100  100                                              1.0 20   18 98    100    100  100                                      52      0.5 0    10 98    98     80   98                                               1.0 10   10 98    98     100  100                                      49      0.5 0    20 75    98     90   95                                               1.0 0    20 80    98     100  95                                       51      0.5 10   15 65    98     80   99                                               1.0 15   20 100   98     100  99                                       78      0.5 0    20 100   98     100  99                                               1.0 0    20 100   98     100  99                                       79      0.5 15   25 98    98     100  99                                               1.0 15   25 98    98     100  99                                       90      0.5 0    10 60    98     --    --                                              1.0 0    10 75    98     100  80                                       __________________________________________________________________________      0 = no damage, 100 = plants withered                                     

                  TABLE 5                                                          ______________________________________                                         Preemergence use in the greenhouse                                                            Test plants and % damage                                                             Echin.    Lolium  Sinapis                                 Compound no.                                                                              kg/ha     c.g.      mult.   alba                                    ______________________________________                                         15         3.0       100       --      100                                     44         3.0        70       100     100                                     9          3.0        70       100     100                                     12         3.0       --        100     100                                     48         3.0       --        --       90                                     50         3.0        70       100     100                                     53         3.0       100       100     100                                     56         3.0        70       --      100                                     52         3.0       100       --      100                                     10         3.0       100       100     100                                     63         3.0       --        100     100                                     7          3.0       --        100     100                                     47         3.0       --        --      100                                     75         3.0       100       100     100                                     76         3.0       100       --      100                                     78         3.0        90       --       90                                     79         3.0       100        80      90                                     40         3.0       100       100     100                                     57         3.0       100       100     100                                     64         3.0       --         80     100                                     65         3.0       --         95     100                                     49         3.0       100       --      100                                     ______________________________________                                          0 = no effect, 100 = seed not germinated or plants completely withered   

                  TABLE 6                                                          ______________________________________                                         Control of unwanted plants;                                                    postemergence treatment in the greenhouse                                      Com-          Test plants and % damage                                         pound          Echin. Ipomoea                                                                               Lamium Sinapis                                                                              Stellaria                            no.   kg/ha   c.g.    spp.   amplex.                                                                               alba  media                                ______________________________________                                         66    1.0     95      95     95     80    80                                   69    1.0     95      95     95     80    80                                   67    1.0     90      95     98     --    80                                   71    1.0     95      95     80     70    70                                   70    1.0     90      95     95     80    --                                   124   1.0     80      80     95     80    80                                   123   1.0     80      90     95     70    90                                   74    1.0     90      95     80     --    70                                   121   1.0     90      90     98     80    70                                   87    1.0     70      --     100    98    90                                   83    1.0     75      95     100    90    100                                  54    1.0     100     100    100    70    100                                  89    1.0     90      98     100    98    100                                  ______________________________________                                          0 = no damage,                                                                 100 = plants completely withered                                         

                                      TABLE 7                                      __________________________________________________________________________     Control of wild oats and other unwanted plants in Gramineae crops;             postemergence treatment in the greenhouse                                      Com-        Test plants and % damage                                           pound       Sorgh.                                                                            Tritic.                                                                            Avena                                                                              Chenop.                                                                             Lamium                                                                              Sinap.                                                                             Sesb.                                                                              Solan.                                no.     kg/ha                                                                              bic.                                                                              aest.                                                                              fatua                                                                              album                                                                               spp. alba                                                                               exal.                                                                              nig.                                  __________________________________________________________________________     182     1.0 20 15  88  --    85  90  100 100                                   179     2.0 15 10  80  100  100  95  100 100                                   196     1.0 --  0  100 100  100  98  100 100                                   55      1.0 -- 10  95   98  --   65   70 --                                    169     1.0 10 --  90  --   --   98  100 100                                   23      1.0  0 --  98  100  100  70  100  95                                   42      1.0  0  0  90  100  100  65   90 100                                   178     1.0 10 --  90  100  100  99  100 100                                   103     1.0  0  0  65   98  100  90  100 100                                   __________________________________________________________________________

                                      TABLE 8                                      __________________________________________________________________________     Selective herbicidal action in cotton; postemergence treatment in the          greenhouse                                                                                 Test plants and % damage                                                       Gossyp.                                                                            Amaranth.                                                                             Echin.                                                                            Ipomoea                                                                             Sesb.                                                                             Solan.                                       Compound no.                                                                           kg/ha                                                                              hirs.                                                                              retrof.                                                                              c.g.                                                                               spp. exal.                                                                             nig.                                         __________________________________________________________________________     137     1.0 0   --    100 92   100                                                                               100                                          191     1.0 0   100   --  --   100                                                                               100                                          125     2.0 0   100   96  --   100                                                                               100                                          122     2.0 0    95   100 95   100                                                                               --                                           190     2.0 0   100   95  98   100                                                                               100                                          197     2.0 10   50   99  92   100                                                                               --                                           189     2.0 10  --    95  98   100                                                                               100                                           68     2.0 0   --    95  100  100                                                                               100                                          __________________________________________________________________________

                  TABLE 9                                                          ______________________________________                                         Herbicidal action; postemergence treatment in the greenhouse                               Test plants and % damage                                                             Centaurea  Echin.                                                                              Ipomoea                                                                               Lolium                                Compound no.                                                                             kg/ha   cyanus    c.g.  spp.   multifl.                              ______________________________________                                         198       3.0     100       --    100    100                                   216       3.0     100       100   100    100                                   205       3.0     100       95    100    90                                    204       3.0     100       100   100    90                                    203       3.0     100       100   100    100                                   215       3.0     100       80    100    100                                   227       3.0     100       50    100    50                                    222       3.0     90        90    100    80                                    224       3.0     90        80    100    90                                    221       3.0     100       90    90     100                                   223       3.0     90        80    80     --                                    106       3.0     100       80    100    80                                    84        3.0     100       80    --     80                                    91        3.0     100       70    100    100                                   128       3.0     100       90    100    90                                    170       3.0     100       90    100    90                                    177       3.0     100       --    --     100                                   181       3.0     100       100   100    90                                    201       3.0     100       95    100    100                                   211       3.0     100       95    100    90                                    218       3.0     100       100   100    90                                    217       3.0     100       90    100    --                                    193       3.0     100       100   100    --                                    192       3.0     100       80    100    90                                    219       3.0     100       90    100    90                                    61        3.0     80        80    40     80                                    62        3.0     100       90    60     80                                    45        3.0     100       90    100    100                                   195       3.0     100       --    100    100                                   132       3.0     100       95    90     60                                    212       3.0     100       80    95     90                                    214       3.0     100       95    100    90                                    171       3.0     --        80    60     40                                    228       3.0     100       100   90     90                                    229       3.0     100       100   100    100                                   230       3.0     100       80    100    80                                    231       3.0     100       100   90     95                                    232       3.0     100       100   100    100                                   233       3.0     100       80    90     90                                    234       3.0     100       20    100    90                                    235       3.0     100       80    100    90                                    236       3.0     100       40    100    80                                    237       3.0     100       40    100    80                                    239       3.0     100       40    100    100                                   ______________________________________                                     

We claim:
 1. A pyrazole ether derivative of the formula ##STR291## where R¹ denotes hydrogen, R² denotes Y--R⁷, Y denoting oxygen or sulfur and R⁷ denoting an alkyl radical of from 3 to 8 carbon atoms, an aryl radical of from 6 to 10 carbon atoms or a cycloalkyl radical of from 5 to 8 carbon atoms, said radicals being unsubstituted or mono- or disubstituted by lower alkyl, halogen, halo lower alkyl, cycloalkyl of 5 to 6 carbons, aryloxy of 6 to 10 carbons in the aryl moiety, lower alkoxy, lower alkylthio, nitro, cyano, lower alkylaminocarbonyl, di-lower alkylaminocarbonyl, lower acyloxy, acylamino or o-lower alkylcarbonyl, R³ denotes the methoxy carbonyl radical and R⁴ denotes hydrogen or methyl, and acid addition salts of agriculturally acceptable acids.
 2. A pyrazole ether derivative selected from the group consisting of 3-(2-methylpropyloxy)-4-methoxycarbonyl-5-methylpyrazole, 3-phenyloxy-4-methoxycarbonyl-5-methylpyrazole, 3-(2,2-dimethylpropyloxy)-4-methoxycarbonyl-5-methylpyrazole, 3-(3-methoxyphenyloxy)-4-methoxycarbonyl-5-methylpyrazole, 3-(cyclopentylmethyloxy)-4-methoxycarbonyl-5-methylpyrazole, and 3-(2-methylcyclohexyloxy)-4-methoxycarbonyl-5-methylpyrazole. 